The 52015 P2B 3/8" Binding Spine (10 Pack, Blue) by Carl is rigid PVC binding combs that make binding easy. It will not scratch, peel, chip or discolor. The 19-ring binders extend to the full length of the book to help protect and keep pages together. You can use this for 11" long sheets. 3/8", 70 sheet capacity. and it comes in a pack of 10.